First Aid Only/Acme United Corporation 90110 PhysiciansCare Antacid, 2/pk, 125pk/bx. Comparable to Tums and Maalox, these antacid tablets are used to relieve the discomfort of heartburn, sour stomach, and acid indigestion. Each tablet is sugar free and contains calcium, a healthy part of any conscientious diet. Active ingredient: Calcium Carbonate 420 mg.